>> reporter: but law enforcement say wednesday's incident is no laughing matter. >> it's a very dangerous thing to do. police show up and they have a -- they believe they have a bad guy. and someone gets shot. >> reporter: unlike "punk'd" these are real cops with real bullets. a volatile situation where someone could easily get hurt. elizabeth. >> no kidding. david, thank you so much. >>> now, to an update on a story we brought you yesterday on "good morning america." local tv anchor jennifer livingston is fighting back after a viewer criticized her weight. now, the man behind that hurtful e-mail is speaking out. and he is not backing down. jennifer has received support from our own abc station, wxow in lacrosse, wisconsin. and abc's linsey davis has more on the story. >> reporter: it was the e-mail that sparked national outrage. >> it reads as follows. surely, you don't consider yourself a suitable example for this community's young people, girls in particular. >> reporter: and this morning, the man behind it finally has a face, with two bulging biceps to match. his name is kenneth kraus